Commodore SX-64 - Page 2

10. Remove the plastic lacks holding (he CPU board and (he I/O board lo (he SX-64 chassis. This should allow iho CPU board enough
freedom of movement to continue with the Kernal ROM installation.
11. Locate the stock SX-64 Kernal ROM on the CPU circuit board using the diagram shown in Figure 4.
12. Remove the Kernal ROM carefully from its socket using the IC extractor or small, flat bladed screwdriver. Allornalely pry the ROM
from the front and back, raising it from its socket a little at a time. If using a screwdriver, take care not to damage the circuit board
while prying.
13. Remove the JiffyOOS Kernal ROM labeled KERNAL-SX from its protective packing. Be careful of the wiring which connects the
Kernal and 1541 ROMs to the selector switch. Put the slock Kernal ROM into the packing for safe keeping.
14. Inspect the JiffyDOS ROM assembly carefully. If you observe any bent pins, carefully straighten them with a pair of tweezers.
15. "Test fit" the JiffyOOS Kernal ROM on the top of the empty Kernal ROM socket but DO NOT PRESS IT INTO PLACE YET.
IMPORTANT: Make sure the notch in the JiffyOOS ROM is aligned as shown below.
Notch
Figure 4: KERNAL ROM LOCATION
16. Make sure that all pins on the Kernal ROM are aligned with the socket If any pins are misaligned, straighten them with a pair of
tweezers.
17. With the pins properly aligned, press the JiffyDOS Kernal ROM into the socket using firm finger pressure on top of Ihe ROM.
18. Make sure that the Kernal ROM assembly is seated evenly and completely in its socket. Make sure that no pins have been benl.
19. Carefully reseat the CPU board into its retaining slots In the SX-64 chassis. Replace the plastic tacks used to hold the CPU board
and I/O board in place. Make sure that no cables have been pulled from from CPU board or other boards and that the I/O Board
(see Figure 3) which plugs into the side of the CPU board is stiJI fully seated in its connector.
20. Locate the 1541 circuit board using the diagram in Figure 3. Remove the plastic tacks holding the circuit board to the SX-64
chassis. This should allow the 1541 circuit board enough freedom of movement to continue with installation.
21. Locate the 1541 DOS ROM on the 1541 circuit board using Figure 5 below.
22. Remove the 1541 DOS ROM carefully from Hs socket using the IC extractor or small, flat-Waded screwdriver (it may be necessary
to reposition the 1541 circuit board in order to gain easy access to the ROM). Alternately pry the ROM from the front and back,
raising it from its socket a tittle at a time. If using a screwdriver, take care not to damage the circuit board while prying.
23. Remove the JrllyDOS ROM labeled 1541 from its protective packing. Put the stock 1541 DOS ROM back into the packing for safe
keeping. t
24. Inspect the JiffyDOS 1541 ROM carefully. If you observe any bent pins, carefully straighten them with a pair of tweezers.
25. Test fit" the 1541 ROM on top of the empty 1541 DOS ROM socket but DO NOT PRESS IT INTO PLACE AT THIS TIME.
IMPORTANT: Be sure that the notch on the JiffyDOS 1541 ROM is aligned as shown below.
Notch —?
Figure 5: 1541 ROM LOCATION
26. Make sure each pin of the JiffyDOS 1541 ROM is aligned properly with the socket. Straighten any misaligned pins wilh a pair of
tweezers.
27. With the pins properly aligned and wilh the ROM notch oriented correctly, carefully press the JiffyDOS 1541 ROM into the socket
using finger pressure until H is fully sealed.
28. Make sure thai the 1541 ROM assembly is seated evenly and completely and that no pins have been bent.
29. Carefully reseat the 1541 circuit board into the SX-64 chassis. Replace the plastic lacks used to hold Ihe board in place. Make
sure that any cables which may have been detached from the 1541 circuit board (or any other boards) are reconnected.
30. Drill a hole in the SX-64 case assembly to facilitate Ihe mounting of the JiffyDOS Selector Switch. The diameter of the hole should
be just slightly larger than the threaded collar on Ihe switch. A location we would recommend Is Ihe upper portion of the rear panel
(visible in Figure 1) near the game ports. Whether you choose this location or an alternate one, make sure that the switch will not
interfere with any of the SX-64 internal electronics or with any cartridges, cables, interfaces, or other devices which will plug into
the SX-64.